Asynchronous Massive MIMO Base Station Cooperation for 5 G Networks and Beyond

该研究项目名为“Asynchronous Massive MIMO Base Station Cooperation for 5G Networks and Beyond”，旨在研究基站之间的分布式协作方案，这些基站配备了大量天线（即，以支持大规模MIMO），以实现多个用户对之间的同时通信（多个对等通信）。这种多用户场景尚未在文献中研究，尽管其实际的重要性。如果考虑到多个用户以由用户的物理位置的差异引起的时间异步方式操作，则进一步突出了这种场景的实际重要性。事实上，在这项研究中，网络被假设为时间异步的，这意味着由一个用户发送的信号经历不同的延迟到达网络中的基站。此外，由不同基站发送的信号对特定用户经历不同的延迟。由于用户链路的这种现实模型，端到端用户信道只能被建模为多抽头频率选择性链路，从而需要宽带考虑、设计和网络分析，而现有文献集中于窄带（单载波）方案。

Titled as "Asynchronous Massive MIMO Base Station Cooperation for 5 G Networks and Beyond", this research proposal aims to study distributed cooperation schemes among base-stations, which are equipped with a large number of antennas (i.e., to support massive MIMO), to enable simultaneous communications between multiple user pairs (multiple peer-to-peer communications). Such a multi-user scenario has not been studied in the literature, despite its practical importance. The practical importance of such scenarios is further highlighted if one takes into account that the multiple users operate in a time-asynchronous manner induced by the difference in the physical locations of the users. Indeed, in this study, the network is assumed to be time-asynchronous, meaning that the signal transmitted by one user undergoes different delays to reach the base stations in the network. Furthermore, the signals transmitted by different base stations undergo different delays to a particular user. Due to this realistic model for the user links, the end-to-end user channels can be modeled only as multi-tap frequency selective links thereby requiring wideband consideration, design, and analysis of the network, while the available literature focuses on narrowband (single-carrier) schemes.